NCERT Solutions for Class 9 Science Unit 11
Work and Energy Class 9
Unit 11 Work and Energy Exercise Solutions
Work is a very normal term, usually one we dislike; "clean up your room !", "mow the lawn !" etc.
This word of "work" brings to mind pushing, pulling, walking back and forth. The very unusual thing about the day-to-day usage is that it is almost identical to the Physics usage of the term.
"The WORK done on an object, is the product of the average force on it and the distance travelled in the direction of the force."
"ENERGY is the ABILITY of an object to do work for whatever reason."